If you use assistive technology (such as a screen reader) and need a
version of this document in a more accessible format, please email email@example.com.
Please tell us what format you need. It will help us if you say what assistive technology you use.
Patent decision: O/063/93 for a reference under section 8(1)(a) by Eugene Richard Mitchell for Patent application no 8807822 in the name of Mark John Charles Stevens dated 20 May 1993.